<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>“网上书城”顶部导航菜单</title>
    <style type="text/css">
        li{float: left;text-align: center;list-style-type: none}
        a{float: left;width: 120px;text-decoration: none;color: white;background-color: purple;padding: 3px 10px;
        border-right: 1px solid white}
        a:hover{background-color: yellow}
    </style>
</head>
<body>
<ul>
    <li><a href="#">首页</a> </li>
    <li><a href="#">用户管理</a> </li>
    <li><a href="#">购物车</a> </li>
    <li><a href="#">订单</a> </li>
    <li><a href="#">退出</a> </li>
</ul>
</body>
</html>